A molten salt tank capable of equalizing the temperature of molten salt in the molten salt tank

Abstract

The invention discloses a molten salt tank structure capable of equalizing the temperature of molten salt in the molten salt tank, and belongs to the technical field of heat storage for photothermal power generation. The structure comprises a tank body, wherein a circulation pipe is fixedly connected to the center of the tank body from the tank top to the tank bottom, a circulation valve is arranged at one end of the circulation pipe, and a plurality of groups of float valves are evenly arranged on the circulation pipe, the float valve controls the opening and closing of the nozzle, and an upper float valve, a middle float valve and a bottom float valve are fixedly connected in sequence from top to bottom through flanges, so that the height difference during the circulation of the molten salt is reduced, and the impact force is reduced, thereby protecting the tank body, extending the service life of the molten salt tank, and saving production costs. At the same time, when the molten salt falls back into the tank after being blocked by the nozzle baffle, the mixing rate of the molten salt can be increased by changing the distance between the nozzle baffle and the nozzle and the installation angle of the nozzle baffle, so that the temperature of the molten salt is more evenly balanced. An eddy current disk is fixedly connected to the inner bottom of the tank body, and when the molten salt is sucked in through the eddy current hole, the molten salt in the tank can be rotated along the suction direction, so that the temperature of the molten salt is more evenly balanced.

Description

Technical Field

[0001] The invention belongs to the technical field of a molten salt tank capable of equalizing the temperature of molten salt in the molten salt tank, and particularly relates to a molten salt tank capable of equalizing the temperature of molten salt in the molten salt tank. Background Art

[0002] Molten salt: a molten body formed by melting salts, such as alkali metal, alkaline earth metal halides, nitrates, and sulfates. Molten salt is a molten body composed of metal cations and non-metallic anions. There are more than 80 kinds of cations and more than 30 kinds of anions that can constitute molten salts, and the combined molten salts can reach more than 2,400 kinds. Since metal cations can have several different valence states and anions can also form different complex anions, the number of molten salts will actually exceed 2,400.

[0003] Binary molten salt (60% sodium nitrate + 40% potassium nitrate) is a mature heat storage medium suitable for solar thermal power generation systems, which has been proven by actual cases. However, this binary molten salt cannot be used in the field of medium-temperature heat utilization, mainly because its freezing point is too high, about 207 degrees Celsius. For medium-temperature heat utilization systems with an operating temperature of about 250 degrees Celsius, molten salt products with lower freezing points must be used.

[0004] Ternary molten salt is a mixed nitrate composed of 53% potassium nitrate + 40% sodium nitrite + 7% sodium nitrate. Its melting point is 142 degrees Celsius and its vaporization point is 500 degrees Celsius. Sodium nitrite will slowly decompose above 450 degrees Celsius, but the operating temperature of the general medium-temperature heat utilization system is within 250-350 degrees Celsius. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the existing molten salt tank has poor performance in maintaining consistent temperatures of the inner and outer layers and the upper and lower layers of the molten salt.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A molten salt tank capable of equalizing the temperature of molten salt in the molten salt tank comprises a tank body, a circulation pipe is fixedly connected to the central vertical axis of the tank body, a circulation valve is arranged at one end of the circulation pipe, a plurality of groups of nozzles are evenly arranged on the circulation pipe, a mounting flange is arranged on the plurality of groups of nozzles, an upper float valve, a middle float valve and a bottom float valve are fixedly connected to the plurality of groups of nozzles from top to bottom in sequence through flanges, and a vortex disk is fixedly connected to the inner bottom of the tank body.

[0008] The upper float valve has the same mechanism as the bottom float valve, and both include a bracket, which is slidably connected to the opening component. The middle float valve includes an opening component and a closing component, which are fixedly installed in a cross shape.

[0009] A sealing sleeve is slidably sleeved on the outer wall of the circulation pipe, a groove is provided on the inner wall of the sealing sleeve, a sealing ring is fixedly connected in the groove, the sealing sleeve is movably fixedly connected to the opening component, and the flange is fixedly connected to the bracket by bolts.

[0010] A regulating valve is arranged at one end of the circulation pipe, and a molten salt pump is fixedly connected to one end of the circulation pipe close to the bottom of the tank body. The molten salt pump is connected to the motor through a driving shaft and a sleeve.

[0011] The bottom of the tank body is fixedly connected with a sedimentation tank, and the bottom of the sedimentation tank is fixedly connected with a discharge valve.

[0012] The vortex disk is provided with a vortex hole, and the vortex disk is provided with a drive shaft hole, a single-piece flange and a pump outlet pipe hole, which are fixed to the flange of the vortex disk with a sealing sleeve.

[0013] The opening component and the closing component both comprise a float, a sleeve cylinder and a float connecting rod. The float connecting rod of the opening component is in a T shape, and the float connecting rod of the closing component is in an inverted V shape.

[0014] The outer sides of the plurality of groups of nozzles are all provided with nozzle baffles.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] When the molten salt in the solar thermal power generation system flows back into the tank through the circulation pipe, the tank is too large, which will cause the impact force of the molten salt falling freely to damage the tank. Therefore, several groups of nozzles are opened on the circulation pipe to evenly divide the circulation pipe into several sections. Flanges are installed at the upper and lower ends of the several groups of nozzles to fix the upper float valve, the middle float valve and the bottom float valve. When the liquid level in the tank is lower than the float position of the bottom float valve, the float loses buoyancy and the sealing sleeve drops, so that the nozzle opens and the molten salt is sprayed out. The molten salt falls back into the tank after being blocked by the nozzle baffle 28, reducing the impact force of the molten salt. When the liquid level rises and approaches the bottom nozzle, the float of the middle float valve floats up to open the middle float valve, while the bottom float valve is closed. When the liquid level continues to rise and approaches the middle nozzle, the middle float valve closes, the float rises and the reverse action of the lever causes the sealing sleeve to close the middle float valve downward. At the same time, the float of the upper float valve rises and opens the upper float valve to form a linkage, so that no matter where the molten salt level in the tank is, the refluxed molten salt can fall to the liquid level surface with a safe drop, so that the impact force of the molten salt is reduced, thereby protecting the tank body, extending the service life of the molten salt tank, and saving production costs. At the same time, when the molten salt falls back into the tank after passing through the nozzle baffle, adjusting the distance between the baffle and the nozzle, adjusting the installation angle of the baffle, and changing the shape of the baffle can change the shape and spray range of the molten salt after being sprayed out to increase the mixing rate of the molten salt and make the temperature of the molten salt more balanced.

[0017] Through the arrangement of the molten salt pump, vortex disk, vortex holes, circulation pipe and tank body, when the molten salt pump pumps the molten salt in the tank body to the circulation pipe, the pressure in the compartment between the vortex disk and the tank body is reduced, and the molten salt in the tank body is sucked into the compartment through the vortex holes. Due to the special structure and layout of the vortex holes, the molten salt in the tank body rotates in a vortex shape, so that the inner and outer layers and the upper and lower layers of the molten salt are fully stirred, so that the inner and outer layers and the upper and lower layers of the entire molten salt are kept consistent, so as to prevent the low-temperature molten salt from causing fluctuations in the heat collection system due to temperature imbalance, and the high-temperature molten salt from causing fluctuations in the heat exchanger due to temperature imbalance, thereby causing turbine fluctuations and further causing generator fluctuations, resulting in reduced efficiency and equipment damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0019] Figure 2 It is a schematic diagram of the structure of the eddy current disk according to an embodiment of the present invention.

[0020] Figure 3 It is a schematic diagram of the top structure of the middle float valve in an embodiment of the present invention.

[0021] Figure 4 It is a schematic diagram of the structure of the circulation pipe according to an embodiment of the present invention.

[0022] Figure 5 It is a schematic structural diagram of a closing assembly according to an embodiment of the present invention.

[0023] Figure 6 It is a structural schematic diagram of an opening component according to an embodiment of the present invention.

[0024] Figure 7 It is a schematic diagram of the motion trajectory of the closing component of an embodiment of the present invention.

[0025] Serial numbers and names of the accompanying drawings: tank body 1, sealing sleeve 2, circulation valve 3, nozzle 4, flange 5, upper float valve 6, middle float valve 7, bottom float valve 8, vortex disk 9, bracket 10, opening component 11, closing component 12, sealing sleeve 13, circulation pipe 14, regulating valve 15, molten salt pump 16, drive shaft 17, motor 18, sedimentation tank 19, discharge valve 20, vortex hole 21, drive shaft hole 22, single-piece flange 23, pump outlet pipe hole 24, float 25, cylinder 26, float connecting rod 27, nozzle baffle 28. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0027] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] Example 1

[0029] like Figure 1-7As shown, a molten salt tank capable of equalizing the temperature of molten salt in the molten salt tank according to the present invention comprises a tank body 1, a circulation pipe 14 is fixedly connected to the central vertical axis of the tank body 1, a circulation valve 3 is arranged at one end of the circulation pipe 14, a plurality of groups of nozzles 4 are evenly arranged on the circulation pipe 14, a mounting flange 5 is arranged on the plurality of groups of nozzles 4, an upper float valve 6, a middle float valve 7 and a bottom float valve 8 are fixedly connected to the plurality of groups of nozzles 4 from top to bottom in sequence through the flange 5, the upper float valve 6 and the bottom float valve 8 have the same mechanism, both comprise a bracket 10, the bracket 10 is slidably connected to an opening component 11, and the The middle float valve 7 includes an opening component 11 and a closing component 12, and the opening component 11 and the closing component 12 are fixedly installed in a cross shape. A sealing sleeve 13 is slidably sleeved on the outer wall of the circulation pipe 14, and a card groove is provided on the inner wall of the sealing sleeve 13. A sealing ring is fixedly connected in the card groove. 13 is connected to the opening component 11 through an active fixed connection, and the flange 5 is fixedly connected to the bracket 10 through bolts. The opening component 11 and the closing component 12 both include a floating ball 25, a sleeve cylinder 26 and a floating ball connecting rod 27. The floating ball connecting rod 27 of the opening component 11 is T-shaped, and the floating ball connecting rod 27 of the closing component 12 is in an inverted V shape. When the liquid level is lower than the bottom nozzle, the middle float valve 7 opens, the float 25 loses buoyancy, and the sealing sleeve 2 drops down and the valve is closed. At the same time, the bottom float valve 8 closes and the float loses buoyancy, and the sealing sleeve 2 drops down and the valve is opened. When the liquid level is higher than the bottom nozzle 4, the float of the bottom float valve 8 floats up, causing the sealing sleeve 2 to rise and the valve is closed. At the same time, the float of the middle float valve 7 rises, causing the sealing sleeve 2 to rise and the middle float valve 7 to open. When the liquid level is higher than the middle nozzle 4, the float 25 of the middle float valve 7 rises, causing the sealing sleeve 2 to fall and the valve is closed. At the same time, the float 25 of the upper float valve 6 rises, causing the sealing sleeve 2 to rise and the upper float valve 6 to open. The two parts are linked to each other, so that the height difference during the circulation of the molten salt is reduced, and the impact force is reduced, thereby protecting the tank body 1, extending the service life of the molten salt tank, and saving production costs. At the same time, when the molten salt falls back into the tank after being blocked by the nozzle baffle 28, changing the distance between the nozzle baffle 28 and the nozzle 4 and changing the installation angle of the nozzle baffle 28 can change the shape and distribution of the molten salt after injection, thereby improving the mixing rate of the molten salt and making the temperature of the molten salt more balanced. The inner bottom of the tank body 1 is fixedly connected with an eddy current disk 9. When the molten salt is sucked in through the eddy current hole 21, the molten salt in the tank will rotate in the suction direction, so that the molten salt can be more fully mixed and the temperature of the molten salt can be more balanced.

[0030] Example 2

[0031] On the basis of Example 1, Example 2 is different from Example 1 in that: a vortex disk 9 is fixedly connected to the inner bottom of the tank body 1, a regulating valve 15 is provided at one end of the circulation pipe 14, a molten salt pump 16 is fixedly connected to the end of the circulation pipe close to the inner bottom of the tank body 1, and the molten salt pump 16 is connected to the motor 18 through a drive shaft 17 and a sleeve, a sedimentation tank 19 is fixedly connected to the bottom of the tank body 1, and a discharge valve 20 is fixedly connected to the bottom of the sedimentation tank 19, and a vortex hole 21 is provided on the vortex disk 9, a drive shaft hole 22, a single-piece flange 23 and a pump outlet pipe hole 24 are opened on the vortex disk 9 and are fixed to the vortex disk 9 with a flange 5 of a sealing sleeve 2, and a nozzle baffle 28 is provided on the outer side of the plurality of groups of nozzles 4, through the molten salt pump 16, the vortex disk 9, The arrangement of the vortex hole 21, the circulation pipe 14 and the tank body 1, through the arrangement of the molten salt pump 16, the vortex disk 9, the vortex hole 21, the circulation pipe 14 and the tank body 1, when the molten salt pump 16 pumps the molten salt in the tank body 1 to the circulation pipe 14, the pressure in the partition between the vortex disk 9 and the tank body 1 is reduced, and the molten salt in the tank body 1 is sucked into the partition through the vortex hole 21. Due to the special structure and layout of the vortex hole 21, the molten salt in the tank body 1 rotates in a vortex shape, so that the inner and outer layers of the molten salt are fully stirred, so that the inner and outer layers of the molten salt are kept consistent, so that the inner and outer temperatures of the entire molten salt are kept consistent, thereby preventing the low-temperature molten salt from causing fluctuations in the heat collection system due to temperature imbalance, and preventing the high-temperature molten salt from causing fluctuations in the heat exchanger due to temperature imbalance, thereby causing turbine fluctuations and further causing generator fluctuations, resulting in reduced efficiency and equipment damage.

[0032] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention.

Claims

1. A molten salt tank capable of equalizing the temperature of molten salt in the molten salt tank, comprising a tank body (1), characterized in that: A circulation pipe (14) is fixedly connected to the central vertical axis of the tank body (1), a circulation valve (3) is provided at one end of the circulation pipe (14), a plurality of groups of nozzles (4) are evenly arranged on the circulation pipe (14), a mounting flange (5) is provided on each of the plurality of groups of nozzles (4), an upper float valve (6), a middle float valve (7) and a bottom float valve (8) are fixedly connected to the plurality of groups of nozzles (4) in sequence from top to bottom through the flange (5), and a vortex disk (9) is fixedly connected to the inner bottom of the tank body (1); A sealing sleeve (13) is slidably sleeved on the outer wall of the circulation pipe (14), a groove is provided on the inner wall of the sealing sleeve (13), a sealing ring is fixedly connected in the groove, the sealing sleeve (13) is movably fixedly connected to the opening component (11), and the flange (5) is fixedly connected to the bracket (10) by bolts; The bottom of the tank body (1) is fixedly connected to a sedimentation tank (19), and the bottom of the sedimentation tank (19) is fixedly connected to a discharge valve (20); The vortex disk (9) is provided with a vortex hole (21), and the vortex disk (9) is provided with a drive shaft hole (22), a single-piece flange (23) and a pump outlet pipe hole (24) and is fixed to the vortex disk (9) by a flange (5) of a sealing sleeve (2).

2. A molten salt tank capable of equalizing the temperature of molten salt in the molten salt tank according to claim 1, characterized in that: The upper float valve (6) has the same structure as the bottom float valve (8), and both comprise a bracket (10). The bracket (10) is slidably connected to an opening component (11). The middle float valve (7) comprises an opening component (11) and a closing component (12). The opening component (11) and the closing component (12) are fixedly installed in a cross shape.

3. The molten salt tank capable of equalizing the temperature of the molten salt in the molten salt tank according to claim 1, characterized in that: A regulating valve (15) is provided at one end of the circulation pipe (14), and a molten salt pump (16) is fixedly connected to one end of the circulation pipe (14) close to the inner bottom of the tank body (1), and the molten salt pump (16) is connected to the motor (18) via a drive shaft (17) and a sleeve.

4. The molten salt tank capable of equalizing the temperature of the molten salt in the molten salt tank according to claim 2, characterized in that: The opening assembly (11) and the closing assembly (12) both comprise a float (25), a sleeve cylinder (26) and a float connecting rod (27); the float connecting rod (27) of the opening assembly (11) is in a T-shape, and the float connecting rod (27) of the closing assembly (12) is in an inverted V-shape.

5. The molten salt tank capable of equalizing the temperature of molten salt in the molten salt tank according to claim 1, characterized in that: A nozzle baffle (28) is provided on the outer sides of the plurality of groups of nozzles (4).

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